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Re: Compositions documentation

From: Kenichi Handa
Subject: Re: Compositions documentation
Date: Tue, 10 Feb 2009 15:26:08 +0900

In article <address@hidden>, Eli Zaretskii <address@hidden> writes:

> I see that the Lisp APIs that deal with compositions
> (composition-get-gstring, compose-region, compose-string,
> find-composition, etc.) are not documented in the ELisp manual.
> Should they be?  Or are these APIs so obscure that no one should futz
> with them?

Compose-region and compose-string are described in
etc/NEWS.21 as this:

*** The function `compose-region' takes new arguments COMPONENTS and
MODIFICATION-FUNC.  With COMPONENTS, you can specify not only a
composition rule but also characters to be composed.  Such characters
may differ between buffer and string text.

*** The function `compose-string' takes new arguments START, END,

*** The function `compose-string' puts text property `composition'
directly on the argument STRING instead of returning a new string.
Likewise, the function `decompose-string' just removes text property
`composition' from STRING.

*** The new function `find-composition' returns information about
a composition at a specified position in a buffer or a string.

If they are not documented now, perhaps RMS decided that
it's not worthwhile.  But, I think it is better to document

On the other hand, composition-get-gstring and the other
several new functions in composite.el are only for Emacs

Kenichi Handa

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